Infectious Mononucleosis (IM) is an acute systemic viral syndrome predominantly caused by the Epstein-Barr virus (EBV), a double-stranded DNA herpesvirus. Commonly known as the “kissing disease,” EBV is transmitted via…

Acute Bacterial Pharyngitis is most frequently caused by Group A β-hemolytic Streptococcus (GABHS / Streptococcus pyogenes), commonly referred to as “Strep throat.” GABHS accounts for 15–40% of acute pharyngitis cases…

Oral Squamous Cell Carcinoma (SCC) represents the vast majority of oral cavity malignancies. Because early-stage lesions are frequently asymptomatic or non-painful, diagnosis is often delayed for months. Recognizing subtle red-flag…

Acute Bacterial Rhinosinusitis (ABRS) is an inflammation of the paranasal sinus mucosa caused by secondary bacterial proliferation following impaired sinonasal drainage. Because viral upper respiratory infections (URIs) present with nearly…

Antibiotic allergy—most notably involving β-lactam antibiotics—presents a major daily challenge in clinical decision-making. While approximately 10% of the population reports a history of penicillin allergy, true IgE-mediated hypersensitivity is present…

Allergic Rhinitis (AR) is an IgE-mediated inflammatory disorder of the nasal mucosa triggered by an interaction between genetic predisposition and environmental allergen exposure. Upon repeat exposure, allergen-specific IgE activates mast…

Anterior Epistaxis (commonly referred to as a nosebleed) represents an acute bleeding event originating from the anterior nasal cavity. It is the most frequent presentation of nasal bleeding encountered across…

Ménière’s disease and Ménière’s syndrome share an identical symptom complex characterized by inner-ear dysfunction. The critical diagnostic boundary rests entirely on etiology: Ménière’s disease is idiopathic, whereas Ménière’s syndrome stems…

Acute Otitis Media (AOM) is an acute infectious and inflammatory process affecting the middle ear space. While classically recognized as a pediatric disease, AOM is a frequent diagnosis in adolescents…